132 lines
3.9 KiB
C++
132 lines
3.9 KiB
C++
/*
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* This program source code file is part of KICAD, a free EDA CAD application.
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*
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* Copyright (C) 2021 Ola Rinta-Koski
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* Copyright (C) 2021-2024 Kicad Developers, see AUTHORS.txt for contributors.
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*
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* Outline font class
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef OUTLINE_DECOMPOSER_H
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#define OUTLINE_DECOMPOSER_H
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#include <vector>
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#ifdef _MSC_VER
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#include <ft2build.h>
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#else
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#include <freetype2/ft2build.h>
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#endif
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#include FT_FREETYPE_H
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#include FT_OUTLINE_H
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#include <math/box2.h>
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#include <math/vector2d.h>
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#include <font/glyph.h>
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namespace KIFONT
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{
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struct CONTOUR
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{
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std::vector<VECTOR2D> m_Points;
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int m_Winding = 0;
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FT_Orientation m_Orientation;
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};
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struct GLYPH_DATA
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{
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std::vector<CONTOUR> m_Contours;
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// Cache of the triangulation data. We'll use this as a hint for triangulating the actual
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// OUTLINE_GLYPHs.
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std::vector<std::unique_ptr<SHAPE_POLY_SET::TRIANGULATED_POLYGON>> m_TriangulationData;
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};
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class OUTLINE_DECOMPOSER
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{
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public:
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OUTLINE_DECOMPOSER( FT_Outline& aOutline );
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bool OutlineToSegments( std::vector<CONTOUR>* aContours );
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private:
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void newContour();
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void addContourPoint( const VECTOR2D& p );
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bool approximateBezierCurve( std::vector<VECTOR2D>& result,
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const std::vector<VECTOR2D>& bezier ) const;
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bool approximateQuadraticBezierCurve( std::vector<VECTOR2D>& result,
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const std::vector<VECTOR2D>& bezier ) const;
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bool approximateCubicBezierCurve( std::vector<VECTOR2D>& result,
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const std::vector<VECTOR2D>& bezier ) const;
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/**
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* @return 1 if aContour is in clockwise order, -1 if it is in counterclockwise order,
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* or 0 if the winding can't be determined.
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*/
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int winding( const std::vector<VECTOR2D>& aContour ) const;
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inline static unsigned int onCurve( char aTags )
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{
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return aTags & 0x1;
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}
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inline static unsigned int thirdOrderBezierPoint( char aTags )
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{
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return onCurve( aTags ) ? 0 : aTags & 0x2;
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}
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inline static unsigned int secondOrderBezierPoint( char aTags )
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{
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return onCurve( aTags ) ? 0 : !thirdOrderBezierPoint( aTags );
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}
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inline static unsigned int hasDropout( char aTags )
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{
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return aTags & 0x4;
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}
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inline static unsigned int dropoutMode( char aTags )
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{
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return hasDropout( aTags ) ? ( aTags & 0x38 ) : 0;
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}
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// FT_Outline_Decompose callbacks
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static int moveTo( const FT_Vector* aEndPoint, void* aCallbackData );
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static int lineTo( const FT_Vector* aEndPoint, void* aCallbackData );
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static int quadraticTo( const FT_Vector* aControlPoint, const FT_Vector* aEndPoint,
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void* aCallbackData );
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static int cubicTo( const FT_Vector* aFirstControlPoint, const FT_Vector* aSecondControlPoint,
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const FT_Vector* aEndPoint, void* aCallbackData );
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private:
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FT_Outline& m_outline;
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std::vector<CONTOUR>* m_contours;
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VECTOR2D m_lastEndPoint;
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};
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} //namespace KIFONT
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#endif // OUTLINE_DECOMPOSER_H
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